Webster's English Dictionary

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grub

1. grub \'gr*b\ vb or grubbed;  or grub.bing [ME grubben; akin to OE grafan 
   to dig - more at GRAVE] 1: to clear by digging up roots and stumps  2: to 
   dig up by or as if by the roots  1a: to dig in the ground usu. for a hidden 
   object  1b: to search about : RUMMAGE  2: TOIL, DRUDGE  - grub.ber n
2. grub n [ME grubbe, fr. grubben] 1: a soft thick wormlike larva of an 
   insect  2a: DRUDGE  2b: a slovenly person  3: FOOD